I mean... It's a feeling. Dysphoria is a complex thing, it's not as clear cut as, let's skip right to surgery.
https://www.healthline.com/health/transgender/can-gender-dysphoria-go-away
Therapy and/or hormone treatment certainly might make enough difference to not require surgery anymore.
Let's not pretend that the act of transitioning is something that should be taken lightly. There are trans people who have been wholly unprepared for actually living life as the opposite gender and kill themselves. For example, I'm seeing cases of Female to Male trans saying they were completely unprepared for how lonely it is to live as a man compared to a woman. So for some of them that negative feeling of loneliness ended up being even more detrimental and unpleasant to them than the original dysphoria.
This is why it's always decades away. However, I doubt China is being as cavalier about it.